{"id":"CVE-2026-90318","state":"PUBLISHED","title":"fat: release buffer head after rebuilding parent","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfat: release buffer head after rebuilding parent\n\nfat_scan_logstart() leaves the matching directory entry's buffer head in\nsinfo.bh for the caller to release, just like fat_scan().\n\nfat_rebuild_parent() uses the directory entry to rebuild the parent inode\nfor the nostale_ro NFS export path, but does not release sinfo.bh after a\nsuccessful scan.  Release it once fat_build_inode() has consumed the\ndirectory entry data.","publishedAt":"2026-09-17T16:08:36.174Z","updatedAt":"2026-10-19T09:01:34.596Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"5e44b6944e11fd6647f028219ad0be4e85e9acee","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"d2a86329152c69a6200c15b2bf618755f8563826","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"0f18d712ba9c980e05b7e33a27cde4fe3ed2d393","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"e38587d98d1ceac608420052c0cdd901d25878f3","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"c6a67aa438179cad40f8ae45469e304338d65c0a","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"571ea4263d69df1b48578e4314a828ecd0604755","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"7565e44507634514e3e1899d3acad3de43f7a2c1","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"83e98dbf19ab64e8528e101e20f8d50e1aaa68a8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fat/nfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fat/nfs.c"]}],"references":["https://git.kernel.org/stable/c/5e44b6944e11fd6647f028219ad0be4e85e9acee","https://git.kernel.org/stable/c/d2a86329152c69a6200c15b2bf618755f8563826","https://git.kernel.org/stable/c/0f18d712ba9c980e05b7e33a27cde4fe3ed2d393","https://git.kernel.org/stable/c/e38587d98d1ceac608420052c0cdd901d25878f3","https://git.kernel.org/stable/c/c6a67aa438179cad40f8ae45469e304338d65c0a","https://git.kernel.org/stable/c/571ea4263d69df1b48578e4314a828ecd0604755","https://git.kernel.org/stable/c/7565e44507634514e3e1899d3acad3de43f7a2c1","https://git.kernel.org/stable/c/83e98dbf19ab64e8528e101e20f8d50e1aaa68a8"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90318.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90318","state":"PUBLISHED","datePublished":"2026-09-17T16:08:36.174Z","dateUpdated":"2026-10-19T09:01:34.596Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.801Z"},"containers":{"cna":{"title":"fat: release buffer head after rebuilding parent","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfat: release buffer head after rebuilding parent\n\nfat_scan_logstart() leaves the matching directory entry's buffer head in\nsinfo.bh for the caller to release, just like fat_scan().\n\nfat_rebuild_parent() uses the directory entry to rebuild the parent inode\nfor the nostale_ro NFS export path, but does not release sinfo.bh after a\nsuccessful scan.  Release it once fat_build_inode() has consumed the\ndirectory entry data."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"5e44b6944e11fd6647f028219ad0be4e85e9acee","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"d2a86329152c69a6200c15b2bf618755f8563826","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"0f18d712ba9c980e05b7e33a27cde4fe3ed2d393","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"e38587d98d1ceac608420052c0cdd901d25878f3","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"c6a67aa438179cad40f8ae45469e304338d65c0a","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"571ea4263d69df1b48578e4314a828ecd0604755","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"7565e44507634514e3e1899d3acad3de43f7a2c1","versionType":"git"},{"version":"f1e6fb0ab451dae8523fbb8c119a653b2730e938","status":"affected","lessThan":"83e98dbf19ab64e8528e101e20f8d50e1aaa68a8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fat/nfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fat/nfs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5e44b6944e11fd6647f028219ad0be4e85e9acee"},{"url":"https://git.kernel.org/stable/c/d2a86329152c69a6200c15b2bf618755f8563826"},{"url":"https://git.kernel.org/stable/c/0f18d712ba9c980e05b7e33a27cde4fe3ed2d393"},{"url":"https://git.kernel.org/stable/c/e38587d98d1ceac608420052c0cdd901d25878f3"},{"url":"https://git.kernel.org/stable/c/c6a67aa438179cad40f8ae45469e304338d65c0a"},{"url":"https://git.kernel.org/stable/c/571ea4263d69df1b48578e4314a828ecd0604755"},{"url":"https://git.kernel.org/stable/c/7565e44507634514e3e1899d3acad3de43f7a2c1"},{"url":"https://git.kernel.org/stable/c/83e98dbf19ab64e8528e101e20f8d50e1aaa68a8"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:01:34.596Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}